[MacPorts] #44719: Add port cantera

[MacPorts]

#44719: Add port cantera
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  Reporter:  macports@…  |      Owner:  macports-tickets@…
      Type:  submission  |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.1
Resolution:              |   Keywords:
      Port:  cantera     |
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Comment (by larryv@…):

 Replying to [comment:14 macports@…]:
 > I assume that the curly braces only make a difference if you use
 > compounds like ${python.version}. Also, $prefix without curly braces
 > is often used in the MacPorts Guide.

 Braces are required if the name of the scalar variable contains any
 character that isn’t a letter, digit, underscore, or Tcl namespace
 separator (two or more consecutive colons).

 More to the point, our current style is to always use the braces in
 Portfiles, for consistency. Some of us also think it’s more readable.

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Ticket URL: <https://trac.macports.org/ticket/44719#comment:15>
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